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Java > Open Source Codes > org > directwebremoting > guice > InternalConverter


1 /*
2  * Copyright 2007 Tim Peierls
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.directwebremoting.guice;
17
18 import com.google.inject.Inject;
19 import com.google.inject.Provider;
20
21 import org.directwebremoting.convert.BaseV20Converter;
22 import org.directwebremoting.extend.Converter;
23 import org.directwebremoting.extend.ConverterManager;
24 import org.directwebremoting.extend.InboundContext;
25 import org.directwebremoting.extend.InboundVariable;
26 import org.directwebremoting.extend.MarshallException;
27 import org.directwebremoting.extend.OutboundContext;
28 import org.directwebremoting.extend.OutboundVariable;
29
30 /**
31  * Specialized converter implementation that uses a Provider to
32  * look up instances to delegate to. This class is used by
33  * {@link InternalConverterManager}.
34  * @author Tim Peierls [tim at peierls dot net]
35  */
36 class InternalConverter extends BaseV20Converter implements Converter
37 {
38     /**
39      * Only used to satisfy bindings for the two-arg {@code bindConversion}
40      * method of {@link AbstractDwrModule}.
41      */
42     @Inject InternalConverter()
43     {
44         this.type = null;
45         this.provider = null;
46     }
47     
48     /**
49      * Adapts a Provider into a Converter.
50      */
51     InternalConverter(Class JavaDoc<?> type, Provider<Converter> provider)
52     {
53         this.type = type;
54         this.provider = provider;
55     }
56
57     public Object JavaDoc convertInbound(Class JavaDoc paramType, InboundVariable data, InboundContext inctx)
58         throws MarshallException
59     {
60         try
61         {
62             return provider.get().convertInbound(type.asSubclass(paramType), data, inctx);
63         }
64         catch (ClassCastException JavaDoc e)
65         {
66             throw new MarshallException(type, e);
67         }
68     }
69     
70     public OutboundVariable convertOutbound(Object JavaDoc data, OutboundContext outctx)
71         throws MarshallException
72     {
73         try
74         {
75             return provider.get().convertOutbound(type.cast(data), outctx);
76         }
77         catch (ClassCastException JavaDoc e)
78         {
79             throw new MarshallException(type, e);
80         }
81     }
82     
83     public void setConverterManager(ConverterManager mgr)
84     {
85         provider.get().setConverterManager(mgr);
86     }
87     
88     private final Class JavaDoc<?> type;
89     private final Provider<Converter> provider;
90 }
91
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